주조용 Al-Si-Cu 알루미늄 합금의 기계가공 및 주조된 표면에서의 양극산화피막 형성
Formation of Anodic Oxide Films on As-Cast and Machined Surfaces of Al-Si-Cu Casting Alloy
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The anodic oxidation behaviour of a cast component of AC2A Al alloy with machined surface and as-cast surface was investigated in sulfuric acid solution. The anodized specimen showed relatively uniform and thick anodic oxide films on the as-cast surface, while non-uniform and very thin oxide films were formed on the machined surface. Non-anodized as-cast surface was observed to be covered with thick oxide scales and showed a number of second-phase particles containing Si, while non-anodized machined surface showed no oxide scales and relatively very small number of Si particles. Thus, the very limited growth of anodic oxide films on the as-cast surface was attributed to the presence of thick oxide scales and Si-containing second-phase particles on its surface.
Abstract
The anodic oxidation behaviour of a cast component of AC2A Al alloy with machined surface and as-cast surface was investigated in sulfuric acid solution. The anodized specimen showed relatively uniform and thick anodic oxide films on the as-cast surface, while non-uniform and very thin oxide films were formed on the machined surface. Non-anodized as-cast surface was observed to be covered with thick oxide scales and showed a number of second-phase particles containing Si, while non-anodized machined surface showed no oxide scales and relatively very small number of Si particles. Thus, the very limited growth of anodic oxide films on the as-cast surface was attributed to the presence of thick oxide scales and Si-containing second-phase particles on its surface.
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